Question

我正在尝试使用EditText对象创建警告对话框。我需要以编程方式设置EditText的初始文本。这就是我所拥有的。

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
// ...Irrelevant code for customizing the buttons and title
AlertDialog alertDialog = dialogBuilder.create();
LayoutInflater inflater = this.getLayoutInflater();
alertDialog.setContentView(inflater.inflate(R.layout.alert_label_editor, null));
EditText editText = (EditText) findViewById(R.id.label_field);
editText.setText("test label");
alertDialog.show();

我需要更改哪些内容才能拥有有效的EditText对象？

[编辑]

因此，user370305和其他人指出我应该使用alertDialog.findViewById(R.id.label_field);

不幸的是，这里还有另一个问题。显然，在AlertDialog上设置内容视图会导致程序在运行时崩溃。您必须在构建器上设置它。

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
// ...Irrelevant code for customizing the buttons and title
dialogBuilder.setView(inflater.inflate(R.layout.alert_label_editor, null));
AlertDialog alertDialog = dialogBuilder.create();
LayoutInflater inflater = this.getLayoutInflater();
EditText editText = (EditText) alertDialog.findViewById(R.id.label_field);
editText.setText("test label");
alertDialog.show();

不幸的是，当您执行此操作时，alertDialog.findViewById(R.id.label_field);现在会返回null。

[/编辑]

Answer 1

editText是alertDialog布局的一部分，所以只需参考editText

访问alertDialog

EditText editText = (EditText) alertDialog.findViewById(R.id.label_field);

更新：

因为在代码行中dialogBuilder.setView(inflater.inflate(R.layout.alert_label_editor, null));

inflater 为空。

更新您的代码，如下所示，并尝试了解每个代码行

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
// ...Irrelevant code for customizing the buttons and title
LayoutInflater inflater = this.getLayoutInflater();
View dialogView = inflater.inflate(R.layout.alert_label_editor, null);
dialogBuilder.setView(dialogView);

EditText editText = (EditText) dialogView.findViewById(R.id.label_field);
editText.setText("test label");
AlertDialog alertDialog = dialogBuilder.create();
alertDialog.show();

更新2：

当您使用Inflater创建的View对象更新UI组件时，您可以直接使用setView(int layourResId)类的AlertDialog.Builder方法，该方法可从API 21及以后版本获得。

Answer 2

使用此

   AlertDialog.Builder builder = new AlertDialog.Builder(activity);
    // Get the layout inflater
    LayoutInflater inflater = (activity).getLayoutInflater();
    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the
    // dialog layout
    builder.setTitle(title);
    builder.setCancelable(false);
    builder.setIcon(R.drawable.galleryalart);
    builder.setView(inflater.inflate(R.layout.dialogue, null))
    // Add action buttons
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {

                    }
                }
            });
    builder.create();
    builder.show();

Answer 3

你可以写：

AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);

 // ...Irrelevant code for customizing the buttons and title

LayoutInflater inflater = this.getLayoutInflater(); 

View dialogView= inflater.inflate(R.layout.alert_label_editor, null);                    
dialogBuilder.setView(dialogView);

Button button = (Button)dialogView.findViewById(R.id.btnName);

   button.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View view) {

         //Commond here......

       }
   });

EditText editText = (EditText)
dialogView.findViewById(R.id.label_field); 

editText.setText("test label"); 

dialogBuilder.create().show();

Answer 4

改变这个：

EditText editText = (EditText) findViewById(R.id.label_field);

到此：

EditText editText = (EditText)  v.findViewById(R.id.label_field);

Answer 5

如果有人想要它在Kotlin：

val dialogBuilder = AlertDialog.Builder(this)
// ...Irrelevant code for customizing the buttons and title
val dialogView = layoutInflater.inflate(R.layout.alert_label_editor, null)
dialogBuilder.setView(dialogView)

val editText =  dialogView.findViewById(R.id.label_field)
editText.setText("test label")
val alertDialog = dialogBuilder.create()
alertDialog.show()

重新发布@user370305's回答。

Answer 6

View v=inflater.inflate(R.layout.alert_label_editor, null);
alertDialog.setContentView(v);
EditText editText = (EditText)v.findViewById(R.id.label_field);
editText.setText("test label");
alertDialog.show();

Answer 7

/**
 * Shows  confirmation dialog about signing in.
 */
private void startAuthDialog() {
    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
    AlertDialog alertDialog = dialogBuilder.create();
    alertDialog.show();

    alertDialog.getWindow().setLayout(800, 1400);
    LayoutInflater inflater = this.getLayoutInflater();
    View dialogView = inflater.inflate(R.layout.auth_dialog, null);
    alertDialog.getWindow().setContentView(dialogView);
    EditText editText = (EditText) dialogView.findViewById(R.id.label_field);
    editText.setText("test label");
}

Answer 8

步骤1。创建文件activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#ecd235"
    >
    <TextView
        android:id="@+id/tv_message"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Simple TextView"
        android:textSize="35dp"
        />
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Apply Red Color Text"
        android:layout_below="@id/tv_message"
        />
</RelativeLayout>

第2步。androidalertdialog_custom_view.xml中的自定义布局alertDialog

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/dialog_rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#c9d4f6"
    >
    <TextView
        android:id="@+id/dialog_titile"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Confirm the change."
        android:padding="5dp"
        android:background="#a2abcd"
        android:textSize="15dp"
        />
    <TextView
        android:id="@+id/dialog_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Want to change the text color?"
        android:padding="15dp"
        android:layout_below="@id/dialog_titile"
        />
    <Button
        android:id="@+id/dialog_neutral_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Cancel"
        android:layout_below="@id/dialog_tv"
        android:background="@drawable/button_bg"
        />
    <Button
        android:id="@+id/dialog_positive_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Yes"
        android:layout_alignBaseline="@id/dialog_neutral_btn"
        android:layout_alignParentRight="true"
        android:background="@drawable/button_bg"
        />
    <Button
        android:id="@+id/dialog_negative_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="No"
        android:layout_toLeftOf="@id/dialog_positive_btn"
        android:layout_alignBaseline="@id/dialog_neutral_btn"
        android:background="@drawable/button_bg"
        android:layout_marginRight="3dp"
        />
</RelativeLayout>

第3步。创建一个文件res / drawable / button_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="oval">
            <solid android:color="#d2ddff"/>
        </shape>
    </item>
</selector>

第4步。创建一个类MainActivity.java

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Get reference of widgets from XML layout
        final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
        final TextView tv_message = (TextView) findViewById(R.id.tv_message);
        Button btn = (Button) findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Build an AlertDialog
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                LayoutInflater inflater = getLayoutInflater();
                View dialogView = inflater.inflate(R.layout.alertdialog_custom_view,null);
                // Set the custom layout as alert dialog view
                builder.setView(dialogView);
                // Get the custom alert dialog view widgets reference
                Button btn_positive = (Button) dialogView.findViewById(R.id.dialog_positive_btn);
                Button btn_negative = (Button) dialogView.findViewById(R.id.dialog_negative_btn);
                Button btn_neutral = (Button) dialogView.findViewById(R.id.dialog_neutral_btn);
                // Create the alert dialog
                final AlertDialog dialog = builder.create();
                // Set positive/yes button click listener
                btn_positive.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // Dismiss the alert dialog
                        dialog.cancel();
                        tv_message.setText("Yes button clicked");
                        // Set the TextView text color red
                        tv_message.setTextColor(Color.RED);
                    }
                });
                // Set negative/no button click listener
                btn_negative.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // Dismiss the alert dialog
                        dialog.cancel();
                        tv_message.setText("No button clicked");
                    }
                });
                // Set cancel/neutral button click listener
                btn_neutral.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // Dismiss/cancel the alert dialog
                        dialog.cancel();
                        tv_message.setText("Cancel button clicked");
                    }
                });
                // Display the custom alert dialog on interface
                dialog.show();
            }
        });
  }
}

链接资源：https://code-android-example.blogspot.com/2019/12/how-to-custom-layout-alertdialog-android.html

AlertDialog.Builder具有自定义布局和EditText;无法访问视图

8 个答案: